Modeling and control of shape memory alloy actuators using Preisach model, genetic algorithm and fuzzy logic

Ahn, Kyoung Kwan and Nguyen, Bao Kha (2008) Modeling and control of shape memory alloy actuators using Preisach model, genetic algorithm and fuzzy logic. Mechatronics, 18 (3). pp. 141-152. ISSN 0957-4158

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Shape memory alloy (SMA) actuators, which have the ability to return to a predetermined shape when heated, have many potential applications in aeronautics, surgical tools, robotics and so on. Nonlinearity hysteresis effects existing in SMA actuators present a problem in the motion control of these smart actuators. This paper investigates the control problem of SMA actuators in both simulation and experiment. In the simulation, the numerical Preisach model with geometrical interpretation is used for hysteresis modeling of SMA actuators. This model is then incorporated in a closed loop PID control strategy. The optimal values of PID parameters are determined by using genetic algorithm to minimize the mean squared error between desired output displacement and simulated output. However, the control performance is not good compared with the simulation results when these parameters are applied to the real SMA control since the system is disturbed by unknown factors and changes in the surrounding environment of the system. A further automated readjustment of the PID parameters using fuzzy logic is proposed for compensating the limitation. To demonstrate the effectiveness of the proposed controller, real time control experiment results are presented.

Item Type: Article
Keywords: Fuzzy, Genetic algorithm, Hysteresis, PID, Preisach model, Self tuning, SMA actuator
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology
T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Depositing User: Bao Kha Nguyen
Date Deposited: 17 Jul 2017 11:22
Last Modified: 17 Jul 2017 11:22
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